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- Fix a couple oops's in cloud.cxx

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- In sky.cxx blend low density cloud layers (few/scattered) into nothing (but
  don't touch visibility distance) as we approach them so we can fly through
  clean.
- For high density cloud layers (broken/overcast) we do not fade the layers
  out, but we fade visibility to nearly nothing as we approach the layer.
This commit is contained in:
curt 2005-01-11 16:02:39 +00:00
parent 01608b7e18
commit efce88ff12
2 changed files with 36 additions and 19 deletions
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18
simgear/scene/sky/cloud.cxx
View File

@ -633,25 +633,25 @@ bool SGCloudLayer::repaint( sgVec3 fog_color ) {
for ( int i = 0; i < 4; i++ ) {
color = cl[i]->get( 0 );
sgCopyVec3( color, fog_color );
color[3] = (i == 0) ? 0.0f : 0.15f;
color[3] = (i == 0) ? 0.0f : cloud_alpha * 0.15f;
for ( int j = 0; j < 4; ++j ) {
color = cl[i]->get( (2*j) );
sgCopyVec3( color, fog_color );
color[3] =
((j == 0) || (i == 3)) ?
((j == 0) && (i == 3)) ? 0.0f : 0.15f : 1.0f;
color = cl[i]->get( (2*j) + 1 );
sgCopyVec3( color, fog_color );
color[3] =
((j == 0) || (i == 3)) ?
((j == 0) && (i == 3)) ? 0.0f : cloud_alpha * 0.15f : cloud_alpha;
color = cl[i]->get( (2*j) + 2 );
sgCopyVec3( color, fog_color );
color[3] =
((j == 3) || (i == 0)) ?
((j == 3) && (i == 0)) ? 0.0f : 0.15f : 1.0f;
((j == 3) && (i == 0)) ? 0.0f : cloud_alpha * 0.15f : cloud_alpha;
}
color = cl[i]->get( 9 );
sgCopyVec3( color, fog_color );
color[3] = (i == 3) ? 0.0f : 0.15f;
color[3] = (i == 3) ? 0.0f : cloud_alpha * 0.15f;
}
}

37
simgear/scene/sky/sky.cxx
View File

@ -266,10 +266,7 @@ void SGSky::modify_vis( float alt, float time_factor ) {
double ratio = 1.0;
if ( cloud_layers[i]->getCoverage() == SGCloudLayer::SG_CLOUD_CLEAR ||
cloud_layers[i]->getCoverage() == SGCloudLayer::SG_CLOUD_FEW ||
cloud_layers[i]->getCoverage() == SGCloudLayer::SG_CLOUD_SCATTERED)
{
if ( cloud_layers[i]->getCoverage() == SGCloudLayer::SG_CLOUD_CLEAR ) {
// less than 50% coverage -- assume we're in the clear for now
ratio = 1.0;
} else if ( alt < asl - transition ) {
@ -289,13 +286,33 @@ void SGSky::modify_vis( float alt, float time_factor ) {
ratio = 1.0;
}
// set the alpha fade value for the cloud layer
float temp = ratio * 2.0;
if ( temp > 1.0 ) { temp = 1.0; }
cloud_layers[i]->setAlpha( temp );
if ( cloud_layers[i]->getCoverage() == SGCloudLayer::SG_CLOUD_CLEAR ) {
// do nothing, clear layers aren't drawn, don't affect
// visibility andn dont' need to be faded in or out.
} else if ( (cloud_layers[i]->getCoverage() ==
SGCloudLayer::SG_CLOUD_FEW)
|| (cloud_layers[i]->getCoverage() ==
SGCloudLayer::SG_CLOUD_SCATTERED) )
{
// set the alpha fade value for the cloud layer. For less
// dense cloud layers we fade the layer to nothing as we
// approach it because we stay clear visibility-wise as we
// pass through it.
float temp = ratio * 2.0;
if ( temp > 1.0 ) { temp = 1.0; }
cloud_layers[i]->setAlpha( temp );
// accumulate effects from multiple cloud layers
effvis *= ratio;
// don't touch visibility
} else {
// maintain full alpha for denser cloud layer types.
// Let's set the value explicitly in case someone changed
// the layer type.
cloud_layers[i]->setAlpha( 1.0 );
// lower visibility as we approach the cloud layer.
// accumulate effects from multiple cloud layers
effvis *= ratio;
}
#if 0
if ( ratio < 1.0 ) {